.pull-down, .pull-up {
	background: #fff;
	height: 40px;
	line-height: 40px;
	font-weight: bold;
	font-size: 14px;
	color: #888;
	text-align: center;
	background-color: #f2f2f2;
	display: none; 
}
.pull-down .pull-down-icon,
.pull-up .pull-up-icon {
	display: inline-block;
	vertical-align: top;
	width: 40px;
	height: 40px;
	background: url(../images/pull-icon@2x.png) 0 0 no-repeat;
	-webkit-background-size: 40px 80px;
	background-size: 40px 80px;
	-webkit-transition-property: -webkit-transform;
	-webkit-transition-duration: 250ms;
}
.pull-down .pull-down-icon {
	-webkit-transform: rotate(0deg) translateZ(0);
}
.pull-up .pull-up-icon {
	-webkit-transform: rotate(-180deg) translateZ(0);
}
.pull-down.flip .pull-down-icon {
	-webkit-transform: rotate(-180deg) translateZ(0);
}
.pull-up.flip .pull-up-icon {
	-webkit-transform: rotate(0deg) translateZ(0);
}
.pull-down.loading .pull-down-icon,
.pull-up.loading .pull-up-icon {
	background-position: 0 100%;
	-webkit-transform: rotate(0deg) translateZ(0);
	-webkit-transition-duration: 0ms;
	-webkit-animation-name: loading;
	-webkit-animation-duration: 2s;
	-webkit-animation-iteration-count: infinite;
	-webkit-animation-timing-function: linear;
}
@-webkit-keyframes loading {
	from {
		-webkit-transform: rotate(0deg) translateZ(0);
	}
	to {
		-webkit-transform: rotate(360deg) translateZ(0);
	}
}